(2r,3r,4as,4bs,10as,10br,11s,12as)-10b-fluoro-2,3,11-trihydroxy-2,10a,12a-trimethyl-3,4,4a,5,6,10a,10b,11,12,12a-decahydrochrysene-1,8(2h,4bh)-dione